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05/09/2024 07:14:13 AM
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Kbuild
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airq.h
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mmu_context.h
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pci_dma.h
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pgalloc.h
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pgtable.h
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processor.h
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tlb.h
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tlbflush.h
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Editing: tlbflush.h
Close
/* SPDX-License-Identifier: GPL-2.0 */ #ifndef _S390_TLBFLUSH_H #define _S390_TLBFLUSH_H #include <linux/mm.h> #include <linux/sched.h> #include <asm/processor.h> #include <asm/pgalloc.h> #include <asm/pgtable.h> /* * Flush all TLB entries on the local CPU. */ static inline void __tlb_flush_local(void) { asm volatile("ptlb" : : : "memory"); } /* * Flush TLB entries for a specific ASCE on all CPUs */ static inline void __tlb_flush_idte(unsigned long asce) { unsigned long opt; opt = IDTE_PTOA; if (MACHINE_HAS_TLB_GUEST) opt |= IDTE_GUEST_ASCE; /* Global TLB flush for the mm */ asm volatile( " .insn rrf,0xb98e0000,0,%0,%1,0" : : "a" (opt), "a" (asce) : "cc"); } #ifdef CONFIG_SMP void smp_ptlb_all(void); /* * Flush all TLB entries on all CPUs. */ static inline void __tlb_flush_global(void) { unsigned int dummy = 0; csp(&dummy, 0, 0); } /* * Flush TLB entries for a specific mm on all CPUs (in case gmap is used * this implicates multiple ASCEs!). */ static inline void __tlb_flush_mm(struct mm_struct *mm) { unsigned long gmap_asce; /* * If the machine has IDTE we prefer to do a per mm flush * on all cpus instead of doing a local flush if the mm * only ran on the local cpu. */ preempt_disable(); atomic_inc(&mm->context.flush_count); /* Reset TLB flush mask */ cpumask_copy(mm_cpumask(mm), &mm->context.cpu_attach_mask); barrier(); gmap_asce = READ_ONCE(mm->context.gmap_asce); if (MACHINE_HAS_IDTE && gmap_asce != -1UL) { if (gmap_asce) __tlb_flush_idte(gmap_asce); __tlb_flush_idte(mm->context.asce); } else { /* Global TLB flush */ __tlb_flush_global(); } atomic_dec(&mm->context.flush_count); preempt_enable(); } static inline void __tlb_flush_kernel(void) { if (MACHINE_HAS_IDTE) __tlb_flush_idte(init_mm.context.asce); else __tlb_flush_global(); } #else #define __tlb_flush_global() __tlb_flush_local() /* * Flush TLB entries for a specific ASCE on all CPUs. */ static inline void __tlb_flush_mm(struct mm_struct *mm) { __tlb_flush_local(); } static inline void __tlb_flush_kernel(void) { __tlb_flush_local(); } #endif static inline void __tlb_flush_mm_lazy(struct mm_struct * mm) { spin_lock(&mm->context.lock); if (mm->context.flush_mm) { mm->context.flush_mm = 0; __tlb_flush_mm(mm); } spin_unlock(&mm->context.lock); } /* * TLB flushing: * flush_tlb() - flushes the current mm struct TLBs * flush_tlb_all() - flushes all processes TLBs * flush_tlb_mm(mm) - flushes the specified mm context TLB's * flush_tlb_page(vma, vmaddr) - flushes one page * flush_tlb_range(vma, start, end) - flushes a range of pages * flush_tlb_kernel_range(start, end) - flushes a range of kernel pages */ /* * flush_tlb_mm goes together with ptep_set_wrprotect for the * copy_page_range operation and flush_tlb_range is related to * ptep_get_and_clear for change_protection. ptep_set_wrprotect and * ptep_get_and_clear do not flush the TLBs directly if the mm has * only one user. At the end of the update the flush_tlb_mm and * flush_tlb_range functions need to do the flush. */ #define flush_tlb() do { } while (0) #define flush_tlb_all() do { } while (0) #define flush_tlb_page(vma, addr) do { } while (0) static inline void flush_tlb_mm(struct mm_struct *mm) { __tlb_flush_mm_lazy(mm); } static inline void flush_tlb_range(struct vm_area_struct *vma, unsigned long start, unsigned long end) { __tlb_flush_mm_lazy(vma->vm_mm); } static inline void flush_tlb_kernel_range(unsigned long start, unsigned long end) { __tlb_flush_kernel(); } #endif /* _S390_TLBFLUSH_H */